const React=require('react');
const PropTypes=require('prop-types');

//UI 组件
class Counter extends React.Component {
  constructor(props) {// 类构造函数(class constructor) 初始化 
    super(props);
  }
  render() {
    return <div className="title">
      <div>INDEX</div>
    </div>
  }
}

export default Counter;

